A 45 year old man has developed an annular rash with a scaly edge on his thigh. The rash has been spreading over the last 3wks. He has some general aches and pains. What is the single most useful investigation?

waelhammad

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2022-11-02

A 45 year old man has developed an annular rash with a scaly edge on his thigh. The rash has

been spreading over the last 3wks. He has some general aches and pains. What is the single

most useful investigation?

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waelhammad

2022-11-02

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The key is C. Lyme antibodies. [Spreading annular rash suggests erythema migrans of lyme disease].

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